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Q1. The energy levels of a certain atom have the following pattern:
E1= -340eV (n = 1),
E2 = -85 eV (n = 2),
E3 = -37.78eV (n = 3), and so on..
An electron drops from n=3 to n=1 in this atom. What is the wavelength in nanometers of the photon emitted in the process? Planck's constant h = 6.626 x 10-34 Joule-sec, 1eV = 1.6 x 10-19 Joules.
Q2. How Many photons per second come out of a ruby laser that is giving out 2 milliwatts of power? (1 watt = 1 Joule/sec and 1 eV = 1.6 x 10-19 Joules). Look up the for what wavelength a ruby laser produces.
Q3. You have three liquids: ethyl alcohol, chloroform and ice-cold Water. When you mix 100 grams of ethyl alcohol at a temperature of T=25 Celsius with 200 grams of ice-cold water (T= 0C), the resulting mixture has a temperature of 5.55 C. When you mix 200 grams of ethyl alcohol at a temperature of T=25 Celsius with 100 grams of chloroform at T=10 C, the resulting mixture has a temperature of 22.22 C. What is the final temperature when you mix 150 grams of ethyl alcohol at T=15 C with 250 grams of chloroform at T=5 C? (You are given that the specific heat capacity at water is 4.2 J/g.K).
Consider a pair of charged parallel plates, each having an area of 5cm^2. what is the magnitude of the electric field in the space
When a hammer strikes a nail, it is compressed along its length. Suppose that a steel nail 6.00 cm long, What is the impulse imparted to the hammer
the three capacitors c3.010-6 f in series are connected across a 30-v battery.a find the charge on each capacitorb find
q. a 2.1-kg block is released from rest and allowed to slide down a frictionless surface and into a spring. the far end
A thin film of water sits on top of a flat piece of glass; and light is incident from below (see the subsequent figure). If the angle of incidence is θ = 20°, what is the angle of refraction of the final outgoing ray?
A playground merry-go-round of radius 2.00 m has a moment of inertia I = 270 kg· m2 and is rotating about a frictionless vertical axle. As a child of mass25.0 kg stands at a distance of 1.00 m from the axle, the system (merry-go-round and child) rota..
Large meteors can impact the earth with speeds of 80,000 km/h. If such a meteor were to impact at a point on the plane of Earth's equator, calculate the mass of the meteor
The brightest star in the night sky is Sirius, which is at a distance of 8.3x1016 m. When we look at this star, how far back in time are we seeing it? Enter answer in years. Do not enter units.
You are shining ultraviolet light on a gas of an unknown element. You know that an electron starts in a ground state with an energy of -13.10 eV. What is the energy of the first photon emitted
An oscillating LC circuit has a current amplitude of8.50 mA, a potential amplitude of 250mV, and a capacitance of 235 nF. What is the maximum energy stored in the capacitor
A flywheel with a diameter of 0.877 m is rotating at an angular speed of 146 rev/min. What is the angular speed of the flywheel in radians per second
A woman with a mass of 55.0kg is standing on the rim of a large disk that is rotating at an angular velocity of 0.470rev/s, Calculate the magnitude of the total angular momentum of the woman-plus-disk system
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